Language file at Garmin marine chartplotter

As you should know it is possible to upgrade at Garmin road units the language file and by it to have at your car portable Garmin unit the menu in your local language. Has anybody an experience making same upgrade for Garmin marine chartpoltters? The difference in this, that in car unit is a micro usb port, but at marine unit you should probably do everything over micro SD.

Thank you in advance for your comments!